Please check the following points to solve the problem.
NOTE: Illustrations shown below are from a representative product and operating system, and may differ from your Brother machine and operating system.

1. Check that you use the paper that meets our specifications.
   > Click here to see the details of the recommended paper.
    
2. The drum unit or toner cartridges may not be installed correctly. Re-install the drum unit and toner cartridges.

    

   • > Click here to see the details of how to install the drum unit.
   • > Click here to see the details of how to install the toner cartridges.

    

3. Make sure that the two gray levers inside the back cover, one on the left-hand side and one on the right-hand side, are in the up position.
   

    

4. Make sure that the media type settings in the printer driver and in the machine's Paper Type menu match the type of paper you are using.
    
5. Select Improve Toner Fixing mode in the printer driver.
   
   For Windows printer driver:

    

   1. Open Printing Preferences. (Click here to see the details of how to open Printing Preferences.)
   2. Click the Advanced tab and click Other Print Options....
      
      
       
   3. Select Improve Print Output in Printer Function, and select the Improve Toner Fixing option. Then click OK.
      
      
       
   4. Click Apply => OK.

    

   
   For Windows BR-Script printer driver:

    

    

   1. Open Printing Preferences. (Click here to see the details of how to open Printing Preferences.)
   2. Click Advanced....
   3. Select Improve Toner Fixing for Improve Print Output in Printer Features, and click OK.
      
      

   
   
   For Mac OS X CUPS printer driver:

    

    

   1. Open the Print dialog. (Click here to see the details of how to open Print dialog.)
   2. Select Print Settings from the pane pop-up menu. Click the Advanced tab and click Improve Print Output....
      
      
       
   3. Select the Improve Toner Fixing option, and click OK.
      
      

    

    

    

   For Mac OS X BR-Script printer driver:

    

    

   1. Open the Print dialog. (Click here to see the details of how to open Print dialog.)
   2. Select Printer Features from the pane pop-up menu.
   3. Select General 2 (Set 3 for Mac OS X 10.4) for Feature Sets, and select Improve Toner Fixing for Improve Print Output.
      
      
6. If the problem continues, change the media type settings in the printer driver and in the machine's Paper Type menu to a thick setting with reference to the following table. For example, if you have set the Media Type to Plain Paper, change it to Thick Paper.
   
   Media Type options

   	For plain papers	For envelopes
   thicker thinner	Thicker Paper Thick Paper Plain Paper Thin Paper	Env. Thick Envelopes Env. Thin